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Police said Dalasta broadsided a minivan driven by Heather DeJoode in 2010. DeJoode's three children were in the car with her at the time.

The crash killed Carson, 5, and Claire, 5 months, injured their brother Chase, 3, and put Heather in a coma.

Dalasta was charged with two counts of homicide by vehicle and two counts of serious injury by vehicle.

Since the crash, there have been a number of delays and continuances. Court records show Dalasta has undergone a number of surgeries and treatments for epilepsy. His family and his attorney said the procedures have left Dalasta unable to assist in his own defense.

Dalasta underwent a psychiatric evaluation in July. The mental competency hearing is scheduled for Aug. 30.